03 Water Supply Flashcards
Average Daily Consumption
Total gallons used in a year divided by the number of days in a year.
The average person uses __________ gallons per day.
80-100
Maximum Daily Consumption
Maximum used within any given 24-hour period. (Generally, 3 years is looked at to find highest amount of use in one day)
Peak Hourly Rate
When water use is considerably higher
Fire Flow Amount
Distribution system will need to carry enough water to cover the peak hourly consumption plus water needed to confine a fire to a complex of buildings or city block
Water Distribution System
Primary Feeders
Secondary Feeders
Distribution Mains
Hydrants
Primary Feeders
16in or larger (can be more than 60in)
Should be taken from multiple sources
Secondary Feeders
12in or larger and connect to Primary or to each other by valves
Distribution Mains
- Connect to indv. customers and hydrants
- At least 8in
Dead End Mains
- Single source (not interconnected)
- Found at edge of rivers, highways, and railroad tracks
Control valves are most likely
Butterfly Valves
ISO recommends valves placed every ____ in commercial and ____ in residential area.
500ft / 800ft
Or quarter mile for primary feeders
Hydrants
Wet Barrel
Dry barrel
Hydrant Class, Flow Capacity + Color
Class AA - 1500gpm or greater - Light blue
Class A - 1000-1499gpm - Green
Class B - 500-999gpm - Orange
Class C - Less than 500gpm - Red
Hydrants in high value areas should not be placed more than _______ apart.
300ft
